高桩承台桩基拱桥整体结构与土相互作用分析

针对在桥梁工程中广泛使用的高桩承台桩基础，介绍了拱桥整体结构与土相互作用的有限元模型的计算方法，结合实例，将此法与传统计算法作了对比，并得出结论。     

A novel application of TPAD-MBR system to the pilot treatment of chemical synthesis-based pharmaceutical wastewater

A pilot-scale test was conducted with a two-phase anaerobic digestion (TPAD) system and a subsequential membrane bioreactor (MBR) treating chemical synthesis-based pharmaceutical wastewater. The TPAD system comprised a continuous stirred tank reactor (CSTR) and an upflow anaerobic sludge blanket-anaerobic filter (UASBAF), working as the acidogenic and methanogenic phases, respectively. The wastewater was high in COD, varying daily between 5789 and 58,792 mg L(-1), with a wide range of pH from 4.3 to 7.2. The wastewater was pumped at a fixed flow rate of 1m(3)h(-1) through the CSTR, the UASBAF and the MBR in series, resulting in respective HRTs of 12, 55 and 5h. Almost all the COD was removed by the TPAD-MBR system, leaving a COD of around 40 mg L(-1) in the MBR effluent. The pH of the MBR effluent was found in a narrow range of 6.8-7.6, indicating that the MBR effluent can be directly discharged into natural waters. A model, built on the back propagation neural network (BPNN) theory and linear regression techniques, was developed for the simulation of TPAD-MBR system performance in the biodegradation of chemical synthesis-based pharmaceutical wastewater. The model well fitted the laboratory data, and was able to simulate the removal of COD.     

首都国际机场新航站楼结构施工新技术

首都国际机场新航站楼建筑面积２６．７８万ｍ２，施工中采用基础滑动层、粗直径钢筋挤压套筒连接、新型模板与脚手架应用、高强混凝土、高效钢筋和无粘结预应力混凝土等多项新技术并有所创新，满足了工程的使用要求和施工质量要求。     

基于 STAR-CCM＋对5415船模的阻力预报

以5415船模为研究对象,介绍了 STAR －CCM＋对5415船模的数值仿真过程,对该船模的阻力、升沉及横倾角进行了数值计算,并与现有的试验值进行对比,验证了 STAR －CCM＋对该船型在静水运动中数值模拟的有效性;研究表明：总阻力系数、剩余阻力系数都是随 Fr 增大而增大,当 Fr ＜0．35时,增长缓慢,当 Fr ＞0．35时,增长迅速;同时在 Fr ＝0．35时,横倾角发生了显著的变化,Fr ＝0．35是该船模静水阻力性能发生变化的分界点。     

BCC金属物理型动态本构关系及在钽中的应用

构建了一种新的、基于塑性变形物理机制的BCC金属动态本构关系,然后将其应用于军用材料钽,通过采用新的约束条件下的多变量非线性规划方法,结合有关流应力实验数据确定出了多晶钽的本构模型。计算结果表明,该模型与实验数据吻合较好,而与Z-A本构模型相比其准确性得到提高,与NN-I本构模型相比预测能力接近,但实用性更强。另外,验证可知该模型的适用条件可以有效外推至很宽的温度及应变率范围。     

基于点质量模型的扰动引力快速计算

为解决扰动引力快速计算的时效性和精确性问题,在点质量模型基础上,根据扰动引力矢量随空间位置的变化规律,提出了三次样条函数对扰动引力空间变化规律进行数值逼近,分别对点质量模型的四个频段空间采样点扰动引力进行样条函数插值仿真,降低了计算复杂度,解决了由于数据计算引起的延时误差问题.结果表明:该方法实现了弹载计算机快速计算,并具有良好的计算精度.     

基于模糊综合评判的装备采购评标方法

针对装备协作配套件采购评标问题,提出将模糊综合评判引入到装备采购的评标中去,建立了基于模糊综合评判的评标模型.以某装备协作配套件采购招标为例,其评标步骤包括:建立评语集、建立权重集、确定各因素隶属函数及进行模糊评判,得出结论.     

A modified solution of radial subgrade modulus for a circular tunnel in elastic ground

In models based on Winkler springs for tunnel lining design, designers always face the difficulty of selecting appropriate values for the radial subgrade modulus (k_r). The widely used solution k_r for a circular tunnel in elastic ground proposed by Wood (1975) was found to be applicable only when the tunnel radial deformation is oval-shaped. On the basis of the Wood׳s solution, this note presents a general solution for k_r when the radial deformation of the tunnel is described by a Fourier series. This modified Wood׳s solution of k_r using compatible stress functions is validated by a numerical example. The modified solution for the example shows good consistency with the original Wood׳s solution when the tunnel becomes an oval shape with deformations. The example indicates that the magnitude of k_r is significantly affected by the distribution shape of the tunnel radial deformation. The value of k_r is no longer a constant value around the tunnel when the tunnel deforms into a general shape described by a Fourier series. It is quite different from the value of k_r for a distribution shape described by a single Fourier term, i.e. one involving a single frequency. The application of a general solution for k_r is illustrated by a design case using a bedded beam model.     

钠硫储能电池保温层二次优化设计

保温层的设计对保证钠硫电池处于最佳运行状态至关重要。为了解决一维热传导模型结果与实验值相差过大的问题,基于三维导热理论模型,采用有限元软件ANSYS Workbench建立了保温层实体模型,数值模拟了各层保温材料的温度分布情况,并提出了一种钠硫电池保温结构二次优化设计方案。结果表明:采用三维模型的计算结果与实验值较接近;优化保温层材料与结构后,保温结构厚度缩减了37.5%,且最外层温度明显减低。实验结果可为储能电池保温结构的二次优化设计提供技术参考。     

我国素质教育模式下的中小学校园空间设计浅析

相对于过去的应试教育,素质教育是依据人的发展和社会发展的实际需要而产生的。总体而言,目前我国中小学校园规划、建筑设计理念、设计标准是与传统教育的以“教师为中心”、“编班授课”特征相匹配的,不能完全满足素质教育的要求。要创造适合素质教育的校园环境,就必须探讨素质教育对中小学校园外部及内部空间设计过程中的促进与影响。